Alexander Gustav von Schrenk (4 February 1816 – 25 June 1876) was a Russian naturalist born near Tula in what was then the Russian Empire. He was a brother to zoologist Leopold von Schrenck (1826–1894). Schrenk was co-founder of the Dorpater Naturforschergesellschaft (Tartu Naturalists' Society). The species Picea schrenkiana (Schrenk's spruce) and Tulipa schrenkii (Schrenck's tulip) are named in his honor.